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Earnings Per Share - Summary (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings (loss) per share — Basic:                      
Earnings (loss) from continuing operations $ (53,076) $ (91,538) $ 75,452 $ 45,890 $ 111,838 $ 91,602 $ 46,169 $ 37,313 $ (23,272) $ 286,922 $ 720,101
Less: Distributed and undistributed earnings allocated to unvested stock                 (453) (1,038) (2,594)
Earnings (loss) from continuing operations available to common shareholders — Basic                 $ (23,725) $ 285,884 $ 717,507
Weighted average common shares outstanding— Basic (shares)                 52,348 52,390 52,613
Earnings from continuing operations per common share — Basic (USD per share) $ (1.02) $ (1.75) $ 1.44 $ 0.87 $ 2.13 $ 1.74 $ 0.88 $ 0.71 $ (0.45) $ 5.46 $ 13.64
Earnings (loss) per share — Diluted:                      
Earnings (loss) from continuing operations $ (53,076) $ (91,538) $ 75,452 $ 45,890 $ 111,838 $ 91,602 $ 46,169 $ 37,313 $ (23,272) $ 286,922 $ 720,101
Less: Distributed and undistributed earnings allocated to unvested stock                 (453) (1,038) (2,594)
Earnings (loss) from continuing operations available to common shareholders — Diluted                 $ (23,725) $ 285,884 $ 717,507
Weighted average common shares outstanding— Basic (shares)                 52,348 52,390 52,613
Effect of dilutive equity awards (shares)                 0 307 373
Weighted average common shares outstanding— Diluted (shares)                 52,348 52,697 52,986
Earnings from continuing operations per common share — Diluted (USD per share) $ (1.02) $ (1.75) $ 1.43 $ 0.87 $ 2.12 $ 1.73 $ 0.87 $ 0.70 $ (0.45) $ 5.43 $ 13.54
Anti-dilutive equity awards and market-based restrictive stock rights not included above (shares)                 2,458 1,330 881